. Bulletin. Natural history; Natural history. May, 1945 Bennett: Overfishing, Onized Lake 403 Table 32.—Age composition of the fish population of Onized Lake; census of June 24-28, 194L Age in Years Species 0 Largemouth bass 33 Black crappie Bluegill 236 Warmouth bass Green sunfish rellow bass Black bullhead i'ellow bullhead Carp Common sucker Golden shiner 8 Blunt-nosed minnow Total 277 1 Total 195 15 3,369 1,165 187 333 1 38 I 5,304 24 7 2,857 466 49 1 12 83 7 1 2 38 6 3,454 115 lis 22 6,545 1,638 245 4 2 347 1 1 90 1 9,171 approximate length of time that was re- quired for them to reach des
. Bulletin. Natural history; Natural history. May, 1945 Bennett: Overfishing, Onized Lake 403 Table 32.—Age composition of the fish population of Onized Lake; census of June 24-28, 194L Age in Years Species 0 Largemouth bass 33 Black crappie Bluegill 236 Warmouth bass Green sunfish rellow bass Black bullhead i'ellow bullhead Carp Common sucker Golden shiner 8 Blunt-nosed minnow Total 277 1 Total 195 15 3,369 1,165 187 333 1 38 I 5,304 24 7 2,857 466 49 1 12 83 7 1 2 38 6 3,454 115 lis 22 6,545 1,638 245 4 2 347 1 1 90 1 9,171 approximate length of time that was re- quired for them to reach desirable sizes. These sizes were attained by most species during the latter part of the second grow- ing season. Some fish escaped being caught during the third season, but only a few remained to begin the fourth or fifth. Of these, the largemouth bass is the most nota- ble and its survival is believed to hinge upon the probability that, of all species represented, it is the most wary and best able to learn from experience. Moreover, the life span of the largemouth is normally somewhat longer than that of other Illi- nois lake fishes. Lines representing a pyramid of num- bers of Onized Lake fish have been super- imposed upon lines representing a similar pyramid for a theoretical fish population (Bennett 1943), fig. 11. This figure. MOSTLY 1941 BROOD LOST IN THE JUNE 24, 1941 CENSUS OF \ Fig. IL—Diagram representing the age-frequency distribution of Onized lake fish, final 1941 census, superimposed upon a pyramid of numbers representing a theoretical fish popula- tion. This diagram suggests that overfishing tends to remove most of the older and larger fish, Dut has little effect upon the production of adequate broods of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
